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Ch.1 - Introduction: Matter, Energy, and Measurement
Brown - Chemistry: The Central Science 15th Edition
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Tutti i libri di testoBrown 15th EditionCh.1 - Introduction: Matter, Energy, and MeasurementProblema 36b
Capitolo 1, Problema 36b

Many scientific data are reported at 25 °C. What is this temperature in kelvins and in degrees Fahrenheit?

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1
Start by converting the temperature from Celsius to Kelvin using the formula: K = °C + 273.15.
Substitute 25 °C into the formula to find the temperature in Kelvin.
Next, convert the temperature from Celsius to Fahrenheit using the formula: °F = (°C × \(\frac{9}{5}\)) + 32.
Substitute 25 °C into the formula to find the temperature in Fahrenheit.
Review the calculations to ensure accuracy and understand the relationship between the temperature scales.

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Temperature Scales

Temperature can be measured in different scales, primarily Celsius (°C), Kelvin (K), and Fahrenheit (°F). Each scale has its own zero point and increment. Understanding how to convert between these scales is essential for interpreting scientific data, as many scientific contexts standardize temperature to Kelvin or Celsius.
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Kelvin Scale

The Kelvin scale is an absolute temperature scale used in scientific contexts, where 0 K (absolute zero) is the point at which molecular motion ceases. To convert Celsius to Kelvin, you add 273.15. Therefore, 25 °C is equivalent to 298.15 K, which is crucial for calculations in thermodynamics and other scientific fields.
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Fahrenheit Scale

The Fahrenheit scale is primarily used in the United States and is based on a different zero point and degree increment compared to Celsius. To convert Celsius to Fahrenheit, you can use the formula F = (C × 9/5) + 32. For 25 °C, this results in 77 °F, which is important for understanding temperature in everyday contexts.
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(b) Carbon dioxide (CO2) is a gas at room temperature and pressure. However, carbon dioxide can be put under pressure to become a 'supercritical fluid' that is a much safer dry-cleaning agent than tetrachloroethylene. At a certain pressure, the density of supercritical CO2 is 0.469 g/cm3. What is the mass of a 25.0-mL sample of supercritical CO2 at this pressure?

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Make the following conversions: f. 0 K to °F

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Make the following conversions: e. 2500 °F to K

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(a) A sample of tetrachloroethylene, a liquid used in dry cleaning that is being phased out because of its potential to cause cancer, has a mass of 40.55 g and a volume of 25.0 mL at 25 °C. What is its density at this temperature? Will tetrachloroethylene float on water? (Materials that are less dense than water will float.)

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The temperature on a warm summer day is 87 °F. What is the temperature in °C?

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(a) To identify a liquid substance, a student determined its density. Using a graduated cylinder, she measured out a 45-mL sample of the substance. She then measured the mass of the sample, finding that it weighed 38.5 g. She knew that the substance had to be either isopropyl alcohol 1density 0.785 g/mL2 or toluene (density 0.866 g/mL). What are the calculated density and the probable identity of the substance?

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